When a game is set to be released as a physical copy, at some point prior to release a version needs to be sent off to burn on to discs. Development of the game typically doesn’t stop, though, which is why we see so many launch day patches. For Kingdom Come: Deliverance launching today on PS4, Xbox One, and Steam, that day one patch is 23GB.

Depending on your Internet connection that’s potentially several hours of patch downloading, and based on my experience of Sony’s PSN servers, even with a fast connection you are going to be waiting quite a while for this patch to finish downloading. Xbox One owners will likely have a similar experience. Apparently it’s worth it, though, as most areas of the game have been improved.

As Gadgets360 reports, developer Warhorse Studios decided to use the time between the release version being shipped to manufacture and the actual launch date to improve the game.

Martin Klima, Executive Producer at Warhorse, detailed the update, stating “quests are more balanced, RPG progression is smoother, the game runs faster and every facet of the game got more polish. The drawback of course is that most of the data in the old build was replaced and has to be downloaded as a patch. At a hefty size, it’s going to take some time to download and it’s a shame.”

The reason the patch is so big comes down to how the game engine and file system works. Will Powers, senior manager for marketing and PR at Deep Silver who is publishing the game, explains in a comment on Resetera that the game is split into 2GB files. If anything changes in one of those files, however small, then the whole 2GB file needs to be downloaded. As the patch touches so many of these files, you end up with a very large download. Those buying digitally were expecting a big download anyway, so it’s physical copy purchasers who suffer here.

Kingdom Come: Deliverance is an action RPG with a medievil setting and focus on historical accuracy. The idea for the game came from Daniel Vavra after leaving 2K Czech. His small development team eventually secured funding from Czech billionaire Zdenek Bakala, then received further funding from a successful Kickstarter campaign in 2014. Today, the game launches on PS4, Xbox One, and on Steam.